The Turkish park service probably sweeps them quite regularly. When they were human in inhabited the smell was probably god awful as well. I've been in the caves, one of many tour groups that day. I only remember the large caved tub to press grapes. That and being crowded, but that was because much of the area was roped off and you had to walk down a two lane path up the middle. The texture of the stone is such that it holds weight under compression, but is rather easy to carve. Of course, all the crops had to grow outside, but finding the entrance seemed very difficult, even for an army looking of them. Breaching the place, and meeting a dozen men armed with spears along the entrance corridor locations, would have proved difficult to cross. And why? To kill farmers, not like they had any gold.